Intel Xeon E3 1220 v2 's Advantages
Higher base frequency (3.1GHz vs 2.5GHz)
Lower TDP (69W vs 140W)
Intel Xeon W 2175 's Advantages
Released 5 years and 5 months late
Higher specification of memory (DDR4-2666 vs DDR3)
Larger L3 cache size (19.25MB vs 8MB)
More modern manufacturing process (14nm vs 22nm)